Merge tag 'i2c-for-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c updates from Wolfram Sang:
 "Core updates:
   - move towards using the 'fwnode' handle instead of 'of_node'
     (meaning 'of_node' even gets removed from i2c_board_info)
   - add support for Write Disable-aware SPD eeproms
   - minor stuff (use new helpers, typo fixes)

  i2c-atr (address translator) updates:
   - support per-channel alias pools
   - added support for dynamic address translation (also adds FPC202
     driver as its user)
   - add 'static' and 'passthrough' flags

  Cleanups and refactorings
   - Many drivers switched to dev_err_probe()
   - Generic cleanups applied to designware, iproc, ismt, mlxbf,
     npcm7xx, qcom-geni, pasemi, and thunderx
   - davinci: declare I2C mangling support among I2C features
   - designware: clean up DTS handling
   - designware: fix PM runtime on driver unregister
   - imx: improve error logging during probe
   - lpc2k: improve checks in probe error path
   - xgene-slimpro: improve PCC shared memory handling
   - pasemi: improve error handling in reset, smbus clear, timeouts
   - tegra: validate buffer length during transfers
   - wmt: convert binding to YAML format

  Improvements and extended support:
   - microchip-core: add SMBus support
   - mlxbf: add support for repeated start in block transfers
   - mlxbf: improve timer configuration
   - npcm: attempt clock toggle recovery before failing init
   - octeon: add support for block mode operations
   - pasemi: add support for unjam device feature
   - riic: add support for bus recovery

  New device support:
   - MediaTek Dimensity 1200 (MT6893)
   - Sophgo SG2044
   - Renesas RZ/V2N (R9A09G056)
   - Rockchip RK3528
   - AMD ISP (new driver)"

* tag 'i2c-for-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (89 commits)
  i2c: Use str_read_write() helper
  i2c: mlxbf: avoid 64-bit division
  i2c: viai2c-wmt: Replace dev_err() with dev_err_probe() in probe function
  i2c: designware: Don't warn about missing get_clk_rate_khz
  i2c: designware: Invoke runtime suspend on quick slave re-registration
  i2c-mlxbf: Improve I2C bus timing configuration
  i2c-mlxbf: Add repeated start condition support
  i2c: xgene-slimpro: Replace dev_err() with dev_err_probe() in probe function
  dt-bindings: i2c: i2c-wmt: Convert to YAML
  i2c: microchip-corei2c: add smbus support
  i2c: mlxbf: Allow build with COMPILE_TEST
  i2c: I2C_DESIGNWARE_AMDISP should depend on DRM_AMD_ISP
  i2c: atr: add passthrough flag
  i2c: atr: add static flag
  i2c: atr: allow replacing mappings in attach_addr()
  i2c: atr: deduplicate logic in attach_addr()
  i2c: atr: do not create mapping in detach_addr()
  i2c: atr: split up i2c_atr_get_mapping_by_addr()
  i2c: atr: find_mapping() -> get_mapping()
  i2c: atr: Fix lockdep for nested ATRs
  ...

1 files changed, 53 insertions, 20 deletions

diff --git a/include/linux/i2c-atr.h b/include/linux/i2c-atr.h
index 4d5da161c225..2bb54dc87c8e 100644
--- a/include/linux/i2c-atr.h
+++ b/include/linux/i2c-atr.h
@@ -19,21 +19,59 @@ struct fwnode_handle;
 struct i2c_atr;
 
 /**
+ * enum i2c_atr_flags - Flags for an I2C ATR driver
+ *
+ * @I2C_ATR_F_STATIC: ATR does not support dynamic mapping, use static mapping.
+ *                    Mappings will only be added or removed as a result of
+ *                    devices being added or removed from a child bus.
+ *                    The ATR pool will have to be big enough to accomodate all
+ *                    devices expected to be added to the child buses.
+ * @I2C_ATR_F_PASSTHROUGH: Allow unmapped incoming addresses to pass through
+ */
+enum i2c_atr_flags {
+	I2C_ATR_F_STATIC = BIT(0),
+	I2C_ATR_F_PASSTHROUGH = BIT(1),
+};
+
+/**
  * struct i2c_atr_ops - Callbacks from ATR to the device driver.
- * @attach_client: Notify the driver of a new device connected on a child
- *                 bus, with the alias assigned to it. The driver must
- *                 configure the hardware to use the alias.
- * @detach_client: Notify the driver of a device getting disconnected. The
- *                 driver must configure the hardware to stop using the
- *                 alias.
+ * @attach_addr: Notify the driver of a new device connected on a child
+ *               bus, with the alias assigned to it. The driver must
+ *               configure the hardware to use the alias.
+ * @detach_addr: Notify the driver of a device getting disconnected. The
+ *               driver must configure the hardware to stop using the
+ *               alias.
  *
  * All these functions return 0 on success, a negative error code otherwise.
  */
 struct i2c_atr_ops {
-	int (*attach_client)(struct i2c_atr *atr, u32 chan_id,
-			     const struct i2c_client *client, u16 alias);
-	void (*detach_client)(struct i2c_atr *atr, u32 chan_id,
-			      const struct i2c_client *client);
+	int (*attach_addr)(struct i2c_atr *atr, u32 chan_id,
+			   u16 addr, u16 alias);
+	void (*detach_addr)(struct i2c_atr *atr, u32 chan_id,
+			    u16 addr);
+};
+
+/**
+ * struct i2c_atr_adap_desc - An ATR downstream bus descriptor
+ * @chan_id:        Index of the new adapter (0 .. max_adapters-1).  This value is
+ *                  passed to the callbacks in `struct i2c_atr_ops`.
+ * @parent:         The device used as the parent of the new i2c adapter, or NULL
+ *                  to use the i2c-atr device as the parent.
+ * @bus_handle:     The fwnode handle that points to the adapter's i2c
+ *                  peripherals, or NULL.
+ * @num_aliases:    The number of aliases in this adapter's private alias pool. Set
+ *                  to zero if this adapter uses the ATR's global alias pool.
+ * @aliases:        An optional array of private aliases used by the adapter
+ *                  instead of the ATR's global pool of aliases. Must contain
+ *                  exactly num_aliases entries if num_aliases > 0, is ignored
+ *                  otherwise.
+ */
+struct i2c_atr_adap_desc {
+	u32 chan_id;
+	struct device *parent;
+	struct fwnode_handle *bus_handle;
+	size_t num_aliases;
+	u16 *aliases;
 };
 
 /**
@@ -42,6 +80,7 @@ struct i2c_atr_ops {
  * @dev:          The device acting as an ATR
  * @ops:          Driver-specific callbacks
  * @max_adapters: Maximum number of child adapters
+ * @flags:        Flags for ATR
  *
  * The new ATR helper is connected to the parent adapter but has no child
  * adapters. Call i2c_atr_add_adapter() to add some.
@@ -51,7 +90,8 @@ struct i2c_atr_ops {
  * Return: pointer to the new ATR helper object, or ERR_PTR
  */
 struct i2c_atr *i2c_atr_new(struct i2c_adapter *parent, struct device *dev,
-			    const struct i2c_atr_ops *ops, int max_adapters);
+			    const struct i2c_atr_ops *ops, int max_adapters,
+			    u32 flags);
 
 /**
  * i2c_atr_delete - Delete an I2C ATR helper.
@@ -65,12 +105,7 @@ void i2c_atr_delete(struct i2c_atr *atr);
 /**
  * i2c_atr_add_adapter - Create a child ("downstream") I2C bus.
  * @atr:        The I2C ATR
- * @chan_id:    Index of the new adapter (0 .. max_adapters-1).  This value is
- *              passed to the callbacks in `struct i2c_atr_ops`.
- * @adapter_parent: The device used as the parent of the new i2c adapter, or NULL
- *                  to use the i2c-atr device as the parent.
- * @bus_handle: The fwnode handle that points to the adapter's i2c
- *              peripherals, or NULL.
+ * @desc:       An ATR adapter descriptor
  *
  * After calling this function a new i2c bus will appear. Adding and removing
  * devices on the downstream bus will result in calls to the
@@ -85,9 +120,7 @@ void i2c_atr_delete(struct i2c_atr *atr);
  *
  * Return: 0 on success, a negative error code otherwise.
  */
-int i2c_atr_add_adapter(struct i2c_atr *atr, u32 chan_id,
-			struct device *adapter_parent,
-			struct fwnode_handle *bus_handle);
+int i2c_atr_add_adapter(struct i2c_atr *atr, struct i2c_atr_adap_desc *desc);
 
 /**
  * i2c_atr_del_adapter - Remove a child ("downstream") I2C bus added by